I have a Yellow Watchman Goby I added to an established tank about 1-1 1/2 weeks ago. I noticed today that he has a good size "bite" out of his back above his tail. He's eating, but I'm wondering if 1) Could the bite heal on its' own...2) Is he now a target? I doubt very seriously I could catch him even tho I have a "Q" tank.

Don't know what has picked on him....this is what is in the tank:
1 Regal Tang, 1 Sm Yellow Tang, 1 Sm Mandarin, 2 Blk/Wht Clowns, 1 Orchid Dottyback, 1 Flamehawk and 1 Purple Firefish. Also 2 Harlequin Serpent Stars added about 2 weeks ago. 2 "hijacker" crabs (sm), 1 "hijacker" pistol shrimp, and 1 Peppermint shrimp, lots of snails and "3" blue legged hermits.

Anybody?